I have modified it with an Auber PID. I have also wired in a switch so it can operate either with the OEM T-stat or the PID AND also and additional off switch.
That was just a little extra for safety I felt comfortable with so it could not be turned on with the Auber in circuit. I cook both my Ribs and Brisket at 275 with
less than 3* temp swings. Also have a wall mounted probe to read box temperature.

1500CXLD, Amerique, PG1000, Tappecue, Thermopen
Good Meat deserves a REST!
It's done when it's done and
If you're happy with the results, that's ALL that matters